Wagon scraper



Feb. 20, 1940. w. J. ADAMS 2,190,969

WAGON SCRAPER Filed Sept. 11, 1937 3 Sheets$heet 1 INVENTOR W JA d a1;23

Feb. 20, 1940. J, ADAMS 2,190,969

WAGON SCRAPER Filed Sept. 11, 1957 .3 Sheets-Sheet 2 INVENTOR W JAdcunsBY QMQQLW ATTORNEY Feb. 20, 1940' W. J. ADAMS WAGON SCRAPER Filed Sept.11, 1937 5 Sheets-Sheet 3 INVE'NTOR Patented Feb. 20, 1940 UNITED STATESPATENT OFFICE WAGON SCRAPER v Application September 11', 1937, SerialNo. 163,418

4 Claims.

This invention relates to large capacity tractor drawn Wagon or carrierscrapers and, particularly represents improvements and refinements overthe structure shown in my Patent No. 2,010,801 dated August 13, 1935.

The improvements particularly deal with the construction, arrangementand operation of the rear door, the design of the side plates, theprovision of a larger dirt discharge opening when the bowl is in adumping position and the reinforcement of the bottom plate of the bowl;the advantages of these improved features over those of the originalscraper being fully set forth and explained in the subsequent portion ofthis specification.

A further object of the invention is to produce a simple and inexpensivedevice and yet one which will be exceedingly effective for the purposefor which it is designed.

These objects I accomplish by means of such structure and relativearrangement of parts as will fully appear by a perusal of the followingspecification and claims. 7

In the drawings similar characters of refer ence indicate correspondingparts in the several views:

Figure 1 is a side elevation of a scraper in a digging position.

Figure 2 is a sectional elevation of the scraper in a carrying position.

Figure 3 is a similar view of the dumping.

Referring now more particularly to the characters of reference on thedrawings, the frame of the scraper comprises a pair of side beams Iconnected at their front end by a cross beam 2 from which a tongue 3projects forwardly. The front end of the tongue has a swivel element 4for connection to a tractor so that the frame is supported againstvertical movement at that end. The rear ends of the side beams, whichslope down somewhat from a point rearwardly of the cross beams, arerigidly connected by a cross shaft 5. Outwardly projecting trunnions 6are mounted on the beams 1 near their rear ends on which either wheels 1or the frames of endless track units may be mounted as operatingconditions may require.

Turnable on the shaft 5 between the side beams is a sleeve 8 which isrigidly welded onto the bottom plate 9 of the main bowl adjacent therear end of said plate. This bowl has side plates Ill rigid with thebottom plate, which extend below the bottom plate sufliciently to engagethe sleeve 8 and also the sides of a heavy long block ll.

scraper as This extends under and braces the bottom plate 9 from aheadof its front end some distance and carries the scraping blade l2. Theback edges of the side plates are disposed at substantially right anglesto the bottom plate 9 while their forward edges slope forwardly somedistance and then rearwardly tothe top edges E, which slant down at anangle relative to the bottom plate to their junction with the backedges.

The bowl tilting mechanism comprises a pair of substantially horizontalhydraulic cylinders l3, one on each side of the bowl. These cylindersare pivoted at their forward end on the beams I intermediate their endsand ahead of the trunnions 6. Piston rods M project from the rear endsof the cylinders and are pivoted on rigid arms l5 intermediate the endsthereof. These arms are disposed between the side plates and the beamsI, being welded against said plates, and are rigid both longitudinallyand laterally of the bowl.

These arms branch at their lower ends so as to engage the sleeve 8 andalso a cross channel [6 which extends under and supports the bottornplate 9 between the sleeve 8 and the block II, the arms being welded tothe sleeve and channel. A positive controlling movement is thus impartedto the bowl without any direct strains being placed on the relativelythin side plates themselves and without any possible distortion oi thebowl.

1 at the back of the bowl at the top, and which was necessary with myprevious scraper, is therefore eliminated, giving advantages which willbe seen later. Also the bottom plate of the bowl is strongly reinforcedagainst buckling by the block II, the channel 16, and the sleeve 8.

The rear closure or door for the bowl comprises side wings l'l disposedclosely inside but projecting rearwardly beyond the plates l0. Thesewings are pivoted on said plates intermediate their ends andintermediate the top and bottom at points ahead of the arms l5 as shownat l8, and the back plate [9 forming-the door proper is curvedconcentric with the pivots l8 and adapted at its lower end to rest onthe bottom plate 9 at its rear end rearwardly of shaft 5. It will benoted that the pivots l8 are nearer the top of the bowl than the bottom,so that the lower portion of the curved door plate has a considerableforward slope. This gives it a relatively large dirt retaining capacityas compared with the door in the original scraper.

The top edges E of the rear portion of the wings, when the plate I9 isresting on the bot- The need for a cross brace tom plate of thebowl,form a straight line ex door opening clearance.

'wardly of the main bowl plates as at 22.

tension of the top edges E of the bowl plates as ance may be had whenthe door is in a wide open I dumping position. At the same time theadvantages of the original door construction are retained, with respectto themwings being partly enclosed and protected by "the bowl, and beingautomatically lifted by outside means. By reason of the relatively highpivot points of the door as previously stated, not only will it, itself,carry a certain amount of dirt,v thus in. effect increasing the lengthof the bowl, but it allows for a greater percentage of dirt beingcarried rearwardly of the bowl pivot shaft 5 than was previously thecase. This'gives a better balance of the loaded bowl, requiring lesspower to raise and dump the load.

By eliminating the previously mentioned cross brace I have been able toreduce the height of the side plates of the bowl at the rear and whichwas previously necessary to allow for sufficient The previous 'sideplates, however, werethus necessarily too'deep (with relation to thewidth of the bowl) for easy loading of the dirt. It might be argued thatit is not necessary to load the bowl to this excessive depth, but thetendency of the operators isto use the top edges of the bowl as a loadgauge line. As a consequence the scraper and tractor were over-strainedin an endeavor to manipulate this actually excessive load. 7

As in the originah scraper the rear door is opened only after the bowlhas been raised to a carrying position and is being further swung towardthe dumping position. This opening of the door is effected by normallyslack cables 20, one on each side. Theseare anchored at their forwardend in connection with the frame beams l and extend over pulleys 2imounted on the arms l5 at the top, and then down to a connection withthe wings" at the bottom and rear- The opening movement of the rear doorthus takes place in the same manner as in the previous structure.However, the pulleys 2| being on the relatively heavy rigid arms 15instead of on the bowl itself, no strain is placed on the latter withthe opening of the door. Also by the present position of the pulleysrelative to the door pivot, a faster opening of the door is obtainedthan was previously the case.

As in the original scraper I have also provided a front dirt carryingapron or auxiliary bowl. This comprises side plates 23 which at therearoverlap the side plates l0 and extending some distance forwardlytherefrom, and a front and bottom plate 24 the upper front portion ofwhich is curved while the lower bottom portion is straight andterminates in a blade 25.. 'The plates 23 and I0 are pivoted togethernear the top as at 26 and the plates 23 are provided ahead of the pivotsand on the outside with rollers 21 adapted to ride on horizontal tracks28 fixed on the beams I. The top edges E" of the front apron sides aredisposed with a downward slope to the front from the point where theynormally overlap or intersect the bowl plates l0 and are on a convergingslope relative to the bottom portion of the plate 24.

As in the .original scraper, the rollers 21 ride on the tracks when thebowl'isin a digging position as shown in Fig. 1 and theb1ade25 is thenabove ground level and also ahead of the scraper blade l2 a certaindistance. The side plates 23 then substantially form a closure betweenthe blade Ziand the plates. .10 at ground leveL preventing :the dirt asscraped from spilling out laterally inthe gap otherwise formed betweenthe blades 2:5 and I2.

to a carrying position the blade'25 engages and As the bowl is swung uprests on the blade l2 and provides a closure therewithas shown in Fig. 2so that all the dirt loaded is retained.

When the bowl is in a digging position and the front apron is in a dirtreceiving position the top loading to capacity by reason of theelimination of any brace across the bowl at the rear, is an relative tothe width of the scraper for easy I important factor in enabling thebowl to be properly loaded. This is because practically all types ofdirt when scraped up tend to hump substantially at the center of lengthof the mass of dirt.

With this new bowl construction therefore the.

side plates of the various cooperating parts of the bowl may be madesufliciently low" at all.

points so that there is no tendency to overload the scraper. At the sametime the'desired slope of the top edges of the dirt enclosing structure,

when in carrying position, is provided which substantially conforms tothe slope normally as Any spilling of the.

sumed by the loaded dirt. dirt at its peakand which occurred with theoriginal scraper is thereforeprevented. I

From the foregoingv description it will 'be readily seen that I haveproduced such a device as-' T:

substantially fulfills the objects'of the invention as set forth herein.

While this specification sets forth in detailthe present and preferred:construction of the de-' vice, still in practice such deviations fromsuch detail may be. resorted-to as do not form a departure from the.spirit of the invention, as defined by the appended claims.

Having thus described-my invention, what I claim. as new and useful anddesire to secure by Letters Patent is:

1. A scraper comprising a frame supported.

from the ground, a'bowl having side plates and'a bottom plate, atransverse member under and,

rigid with the bottom plate, means 'prvotally supporting said memberwherebythebowl my swing between scraping and dumping positions-aboutthemember as an axis, side'arms rigid with the side plates on the outsideupstanding from and rigid with said member, means to swing the bowlapplied to said-arms, another transverse member extending under andreinforcing the-bottom plate ahead of said first named member and rigidbranches-extending forwardly from the arms intermediate their ends andrigidly secured to the endsof said other transverse member.

2. A scraper comprising a frame supported from the ground, a bowl havingside plates, means pivoting the bowl on the frame for swinging movementbetween scraping and dumping positions', side arms rigid with the sideplates extending upwardly from the pivot points of the bowl, a normallyclosed rear door for the bowl. having side wings overlapped by the sideplates, means pivoting said wings on the plates, means to swing the bowlapplied to said arms intermediate their ends, and means causing the doorto open with swinging movement of the bowl beyond a carrying positionand including cables at the sides of the bowl and door, means anchoringthe front and rear ends of the cables on the frame and doorrespectively, and pulleys on the arms above the point of application ofthe swinging means and engaging the cables intermediate their ends.

3. In a scraper, a main bowl having a bottom and side plates, a frontapron having a bottom and side plates overlapping and projectingforwardly from the side plates of the bowl, means pivoting theoverlapping portions of the side plates of the bowl and apron together,the apron forming a closed forward extension of the bowl when the latteris in a carrying position and means acting on the apron to dispose therear end of the bottom 0! the same spaced ahead of and above the bottomof the bowl when the latter is in a digging position; the top edges ofthe side plates of the bowl and apronbeing cut so as to be substantiallyparallel to each other when the apron is in the latter position and soas to slope downwardly from their point of intersection when the bowland apron are in carrying position.

4. A scraper comprising a frame supported from the ground, a bowl, meanspivoting the bowl on the frame for swinging movement between scrapingand dumping positions, side arms rigid with the bowl extending upwardlyfrom the pivot points of the bowl, means to swing the bowl applied tosaid arms, a normally closed rear door for the bowl, means pivoting thedoor intermediate the top and bottom thereof on the bowl for openingmovement in an upward direction and means to thus move the door with theswinging i movement of the bowl beyond a carrying position over whichthe cable passes intermediate its ends.

WILLIAM J. ADAMS.

